Universal load handling apparatus



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7. IN LOAD HANDLING APPARATUS ADAPTED FOR MOUNTING ON A VEHICLE, A LOADHANDLING UNIT, POWER-OPERATED LIFTING AND LOWERING MEANS FOR LIFTING ANDLOWERING SAID UNIT, AND MEANS FOR TILTING SAID UNIT RELATIVE TO SAIDLIFTING AND LOWERING MEANS, SAID LOAD HANDLING UNIT COMPRISING A REARLOAD HANDLING SECTION, A FRONT LOAD HANDLING SECTION ARRANGED FORMOVEMENT BETWEEN A CLOSED POSITION AND AN OPEN POSITION RELATIVE TO SAIDREAR LOAD HANDLING SECTION, AND ACTUATING MEANS FOR EFFECTING SAIDOPENING AND CLOSING OF THE FRONT LOAD HANDLING SECTION RELATIVE TO THEREAR LOAD HANDLING SECTION, EACH SAID FRONT AND REAR LOAD HANDLINGSECTIONS HAVING A BOTTON EDGE, AND QUADRILATERAL LINKAGE MEANS MOUNTINGSAID FRONT SECTION AND ITS BOTTOM EDGE FOR MOVEMENT THROUGH APREDETERMINED OPENING AND CLOSING PATH RELATIVE TO THE REAR LOADHANDDLING SECTION AND ITS BOTTOM EDGE IN WHICH THE BOTTOM EDGE OF THEFRONT SECTION FOLLOWS AN ARCUATE PATH FROM ITS MAXIMUM OPEN POSITIONDOWNWARDLY TO ADJACENT A SWEEP PLANE INCLUDING THE BOTTOM EDGE OF THEREAR SECTION AND THEN CONTINUES IN A SUBSTANTIALLY STRAIGHT LINEMOVEMENT ALONG SAID PLANE UNTIL THE TWO CUTTING EDGES ARE IN PROXIMATERELATION, THE QUADRILATERAL LINKAGE MEANS INCLUDING A PAIR OF VERTICALLYSPACED FIXED PIVOTS ON THE REAR SECTION, THE LOWER FIXED PIVOT BEINGSPACED ABOVE AND BEHIND SAID BOTTOM EDGE OF THE REAR SECTION AND THEUPPER FIXED PIVOT BEING SPACED ABOVE THE LOWER FIXED PIVOT TO DEFINE THEFIXED LINK OF THE QUADRILATERAL LINKAGE MEANS, SAID FIXED LINK LYING INA PLANE INCLINED AT A SMALL ANGLE OFF PERPENDICULAR TO SAID SWEEP PLANE,LOWER RIGID NON-EXTENSIBLE ARM MEANS PIVOTALLY CONNECTED TO THE REARSECTION ON SAID LOWER FIXED PIVOT AND PIVOTALLY CONNECTED TO THE FRONTSECTION ON A THIRD PIVOT DISPOSED ADJACENT TO THE UPPER END OF THE FRONTLOAD HANDLING SECTION TO DEFINE BETWEEN SAID LOWER FIXED AND THIRDPIVOTS THE ROCKER LINK OF SAID QUADRILATERAL LINKAGE MEANS, AND UPPERRIGID NON-EXTENSIBLE ARM MEANS PIVOTALLY CONNECTED TO THE REAR SECTIONON THE UPPER FIXED PIVOT AND ALSO PIVOTALLY CONNECTED TO THE FRONTSECTION ON A FOURTH PIVOT SPACED ABOVE SAID THIRD PIVOTS TO DEFINEBETWEEN SAID UPPER FIXED AND FOURTH PIVOTS THE CRANK LINK OF SAIDQUADRILATERAL LINKAGE MEANS, THE SPACING BETWEEN THE THIRD AND FOURTHPIVOTS ON THE FRONT SECTION DEFINING THE COUPLER LINK OF THEQUADRILATERAL LINKAGE, THE STRAIGHT LINE LENGTH OF SAID COUPLER LINKBEING ABOUT ONE HALF THE LENGTH OF THE FIXED LINK AND EQUALSUBSTANTIALLY TO THE SPACING OF THE FIXED LOWER PIVOT FROM THE BOTTOMEDGE OF THE REAR LOAD HANDLING SECTION, THE CRANK LINK HAVING A STRAIGHTLINE LENGTH OF ABOUT NINE-TENTHS THE LENGTH OF THE FIXED LINK AND THEROCKER LINK HAVING A STRAIGHT LINE LENGTH ABOUT ONE AND ONE-THIRD THELENGTH OF THE FIXED LINK, THE STRAIGHT LINE DIMENSIONS OF SAID FOURLINKS BETWEEN THE FOUR PIVOTS AND THEIR RELATION TO THE BOTTOM EDGES OFTHE TWO SECTIONS CAUSING THE BOTTOM EDGE OF THE FRONT SECTION TO FIRSTFOLLOW AN ARCUATE PATH IN THE CLOSING OF THE FRONT SECTION OF THE REARLOAD HANDLING SECTION AND THEN TO ENTER SAID SWEEP PLANE AT A DISTANCEFROM THE INTERSECTION OF THE SWEEP PLANE AND FIXED LINK PLANE EQUAL TOGREATER THAN THE LENGTH OF THE FIXED LINK, THEREAFTER FOLLOWINGSUBSTANTIALLY ALONG SAID SWEEP PLANE, UNTIL THE TWO SECTIONS ARE INCLOSED POSITION AND THEIR BOTTOM EDGES ARE IN PROXIMATE RELATION.